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Pension, Postretirement and Postemployment Defined Benefit Plans - Net Periodic Cost (Benefit) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 25, 2022
Dec. 26, 2021
Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost for benefits earned during the period $ 5 $ 456
Interest cost on projected benefit obligation 2,592 1,936
Expected return on plan assets (2,548) (4,536)
Amortization of net gain (loss) 2 (1,259)
Amortization of prior service benefit 213 0
Curtailment gain 0 (1,027)
Pension and postretirement medical benefit 264 (4,430)
Postretirement Medical Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost for benefits earned during the period 17 27
Interest cost on projected benefit obligation 149 85
Expected return on plan assets (295) (263)
Amortization of net gain (loss) (254) (249)
Amortization of prior service benefit (162) (162)
Pension and postretirement medical benefit $ (545) $ (562)